Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cd8cc84b3257fd…

MALICIOUS

PDF

76.9 KB Created: 2021-01-01 07:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850da68a0b08f0c19b56327e0c208d0d SHA-1: b38d49418e87a01ecde220dc0278a935c075e233 SHA-256: 71cd8cc84b3257fd2d61639cb5006b60b993efdf0b62da9deaabdac7e32b84ca
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=how+much+does+coach%2527+s+eye+cost
    • https://cdn.sqhk.co/mebereserab/jQa0het/shark_attacks_maui_kaanapali_beach.pdf
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/2bcddf8636.pdf
    • https://vaforiduzaxofa.weebly.com/uploads/1/3/4/3/134367440/fe42aa5a4.pdf
    • https://cdn.sqhk.co/vutexexukus/iiWmIAq/74298655292.pdf
    • https://cdn-cms.f-static.net/uploads/4416786/normal_5fb72ed59be92.pdf
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/zinaz.pdf
    • https://gavizule.weebly.com/uploads/1/3/4/6/134659779/miveporemezepapowoki.pdf
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/nanokuseretugikom.pdf
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5f9fa6a0c7b73.pdf
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/losebexobotur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/072048eb-9541-4dd5-be33-0147e35a958d/26556653132.pdf
    • https://uploads.strikinglycdn.com/files/3e0d0107-8a6d-45d3-917b-492cdd404c18/8087197222.pdf
    • https://s3.amazonaws.com/zuxadol/phonics_dance_hunks_and_chunks.pdf
    • https://uploads.strikinglycdn.com/files/f77e87a6-9cbb-448a-9495-7d3fb02f7ba9/greek_mythology_gods_myths_about_nature.pdf
    • https://s3.amazonaws.com/medaliwifufugel/48165725415.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b5.bin
9c517d2b232742bbae734741b326af407fddf15c3b981bf48b4c3f051dc89ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 5240 bytes
font_01_sfnt_off0001027e.bin
a3f6fb8faedb4293bd403c4e956b3ad2b678d1078f4ae94dcd654ec176c18f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10684 bytes

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